Fireproof stairway.



UNITED STATES Patented December 22, y193.

PATENT OFFICE.

FRANCIS A..WINSLOW, OF CHICAGO, ILLINOIS, ASSIGNOR TO THF WINSLOW BROS. COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FIREPRoo'F STAIRWAY.

SPECIFICATION forming part of Letters Patent No. 747,825, dated December22, 1903. Application filed October 28, 1903. Serial No. 178,816. (No model.)

To wl whom t Wawy concer-rt:

Be it known that I, FRANCIS A.'WINsLow, a citizen of the VUnited States of America` residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Fireproof Stair.-

ways, of which the following is a specification.

My invention relates to'certain new and to useful improvements in fireproof stair-ways; and its object is-to produce adevice of this class which shall be simple, comparatively cheap in construction, thoroughly fireproof, and which shall lend itself readily to ornai5 mentation of various sorts.

l z5 struction, the line of section being indicated by t-he line 1 l of Fig. 4:. Fig. 2 is alongitudinal section in the line 2 2 of Fig. 4 on a smaller scale than Fig. l and showing the entire stairway. Fig. 3 is a horizontal sec- 3o tion in the line 3 3 of Fig. l; and Fig. 4 is a vertical transverse section in the line 4 4 of Fig. 2, the concrete filling being removed to show the metal construction.

Referring to the drawings, A A indicate 3 5 two suitable side plates which are su pported in any desirableway at their two ends. These side plates are provided along their lower edges with inwardly-projectingfianges a, Fig.

4. A soffit B, consisting of a flat plateof metal 4o of the width'of the stairway, is bolted or otherwise secured to the inwardly-projecting flange'saof thes-ideplatesand supported thereby, and the two ends of this soft are suitably secured to the edges of the floors at the ends of the stairway. Risers C aresecured tothe soffit by boltsor rivets passing through the soft `and through suitable diagonally bent or curved flanges c upon each riser. The side plates A are provided with inwardly- 5o projecting lugs a', which are suitably spaced to receive bolts or rivets which pass through the endsA ofY the risers, as shown in Fig. 3. In this way the risers are secured to the soflit at their lower edge and to the side plates at their ends. A shortvdistance from the top of each riser is a backwardly-projecting lug vc', to which is bolted or riveted a brace D, t

which extends backward Yto the soffit and is bolted or riveted thereto a short distance below the attachmentof the next'riser upward. 6o When the stairway has been completed to thispoint, the space behind each riser is filled with cement or other fireproof material to theV level of the braces D. The upper portion of the steps is then filled with a finer grade of cement or composition suitable for forming-a A fireproof tread, or in the alternative a slab of stone or any desired tread-forming substance is used. Two forms of tread are shown in Fig. 2, the two lower steps being com posi- 7o tion treads and the two upper steps being stone treads. In this latter case it will be noted the upper edge of the riser is cut off,

so that the tread projectsout over the riser instead of abutting against the rear edge thereof.

It will be seen that-this stairway' is very simple and its .fireproof quality is evident. Furthermore,.its surfaces are almost entirely [iat surfaces of considerable extent, so that 8o any desirable scheme of ornamentation can be adopted. This is especially true of the sofit, which occupies the entire lower side of the stairway and can be made the basis for a large amount of ornamental work. 85 I realize that considerable variation is possible in the details of this construction without departing from thespiritl of the invention, and I therefore do not intend to limit myself to the specific form herein shown and 9o described.

I claim as new and desire to secure by Letters Patentp 1. In a device of t-he class described, the combination with'suitable side plates sup- 95 ported at their upper and lower ends, of a substantially dat soflit secured to the lower edges of the side plates, a plurality of risers securedV at their lower edges to the soft-lt and at their ends to the side plate, and a bodyof ico fireproof plastic material in the spaces behind the risers.

2. In a device of the class described, the combination with suitable side plates, of a substantially fiat soft secured to the lower edges thereof, a plurality of risers secured at their lower edges to the soit and at their ends to the side plates, a body of fireproof plastic material in the steps 'behind each riser, and a suitable tread, covering each body of plastic material.

3. In a device of the class described, the,

combination with suitable side plates, of a substantially flat sot secured to the lower edges of the side plates, a plurality of risers secured at their lower edges to the soft, and at their ends to the side plates, a suitable brace connecting each riser near its upper end with the soffit, and a body of plastic ireproof material in the steps behind each riser.

4. In a device of the class described, the combination with suitable side plates having inwardly-projecting flanges at their lower edges, of a substantially flat sofflt bolted to the flanges, inwardly-projecting lugs on the side plates, suitable risers secured to the sofit at their lower edges and secured to the inwardly-projecting lugs ou the side plates at their ends, and suitable fireproof material in the steps behind each riser.

5. In a device of the class described, the combination with suitable side plates having inwardly-projecting anges at their lower edges, of a substantially fiat soffit secured to the flanges on the side plate, suitable risers secured at their lower edges to the softlt, in-

wardly-projecting lugs on the side plates,

means for securing the risers at their ends to the inwardly-projecting lugs on the side plates, rearwardly extending lugs on the risers, and braces secured at one end to the lugs on the risers and at their other ends to the soiiit.

In witness whereof I have signed the above application for Letters Patent, at Chicago, in the county of Cook and State of Illinois, this 23d day of October, A. D. 1903.

FRANCIS A. WINSLOW.

Witnesses:

M. D. MILLNER, R. E. PAUL. 

